Explain Different Methods of Contraception Prevention of pregnancy is called contraception. The techniques used in preventing the occurrence of pregnancy are called contraceptive devices. Mechanical Barrier Methods of Contraception : Condom : It is tubular latex sheath which is worn over the male copulatory organ or penis during sex. Cerival cap : It is rubber nipple … [Read more...] about Explain Different Methods of Contraception
What is Menstrual Cycle
What is Menstrual Cycle If the egg is not fertilized, it lives for one day and is then expelled. This sets in motion which is called menstrual or ovarian cycle. The first menstruation is called menarche. It stops between age 45–50 years. Stoppage of menstruction permantely is called menopause. Menstrual cycle consists of four phases. Menstrual Phase : It is … [Read more...] about What is Menstrual Cycle
How would you Describe the Image Formed by a Plane Mirror
How would you Describe the Image Formed by a Plane Mirror Reflection from the Plane Mirror Relation between the distances of the object and the image from the plane mirror is that they are equal. To verify this, consider the geometrical construction shown in figure. Rays OP and OD, starting from the object O, fall on the mirror. The ray OP is perpendicular to the mirror … [Read more...] about How would you Describe the Image Formed by a Plane Mirror
What is the Law of Reflection of Light?
What is the Law of Reflection of Light? First law : The incident ray, the reflected ray and the normal at the point of incidence, all lie in the same plane. Second law : The angle of reflection (∠r) is always equal to the angle of incidence (∠i). i.e., ∠r = ∠i (For normal incidence, i = 0, r = 0. The ray is reflected back along normal). In figure the image of an … [Read more...] about What is the Law of Reflection of Light?
What are the Characteristics of Light
What are the Characteristics of Light The Characteristics of light : Light is an electromagnetic wave. Light travels in a straight line. Light is a transverse wave, and does not need any medium to travel. Light can travel through vaccum. Its speed through vaccum is 3 × 108 m/s. The velocity of light changes when it travels from one medium to another. The … [Read more...] about What are the Characteristics of Light